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Background: The aim of this study was to explore the current status of vitamin D 2 (VD 2 ) deficiency in hospitalized children in a region of China., Methods: The instances of detection of vitamin D (VD) and VD 2 in children who visited the hospital from January 2022 to May 2023 were analyzed retrospectively. Additionally, the relationships between VD 2 level and gender and age were further analyzed. Furthermore, for departments with a high frequency of VD detection, the VD 2 deficiencies in children with different diseases were further analyzed., Results: Among the different age groups, children aged 11-15 years exhibited the most severe VD 2 deficiency, followed by those aged 7-10 years, 0-1 years, and 2-6 years. Moreover, 25(OH)D 2 levels were significantly lower in children aged 7-10 years and 11-15 years compared with 2-6 years. Gender did not have an impact on the level of 25(OH)D 2 . When analyzing the orthopedics, dermatology, thoracic surgery, and nephroimmunology departments' data on children's levels of 25(OH)D 2 , it was found that an average of approximately 76.56% had levels below <1.5 ng/ml compared to individuals with levels between >15 ng/ml and 100 ng/ml. The average ratio between individuals with <1.5 ng/ml vs. those with <15 ng/ml was found to be 91.22%., Conclusions: Children who came to the hospital were severely deficient in VD 2 . The degree of deficiency was related to age, but there was no gender difference. The phenomenon of VD 2 deficiency was reflected in children with both skeletal and non-skeletal diseases., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (© 2024 Liu, An, An, Zhao, Zhang and Zhao.)